Retransmitting #6 (NAT) to 202.173.130.86:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.53:5060;branch=z9hG4bK1940273304;received=202.173.130.86;rport=5060
From: <sip:chesty@192.168.1.53>;tag=634875103
To: <sip:9999@k-sit.com>;tag=as6dd2394d
Call-ID: 1163629076@192.168.1.53
CSeq: 20 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Contact: <sip:9999@192.168.0.1>
Content-Type: application/sdp
Content-Length: 259

v=0
o=root 6715 6715 IN IP4 192.168.0.1
s=session
c=IN IP4 192.168.0.1
t=0 0
m=audio 16350 RTP/AVP 3 0 8 101
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -